Versions of Iowa Code 321D.2 - Enforcement on LawServer 2023 Iowa Code 321D.2 – Enforcement 2022 Iowa Code 321D.2 – Enforcement 2020 Iowa Code 321D.2 – Enforcement 2018 Iowa Code 321D.2 – Enforcement 2016 Iowa Code 321D.2 – Enforcement 2014 Iowa Code 321D.2 – Enforcement. 2009 Iowa Code 321D.2 – Enforcement